<script lang="ts" setup name="GoodsImage">
import { computed, ref } from 'vue';
import {useMouseInElement} from '@vueuse/core'

defineProps<{
    images:string[]
}>()
const current=ref(0)

// vue函数库放大镜功能
const target=ref(null)
const {elementX,elementY,isOutside}=useMouseInElement(target)

// 遮罩层跟随鼠标移动
const position=computed(()=>{
    let x=elementX.value-100
    let y=elementY.value-100
   if(x<=0) x=0
   if(x>=200) x=200
   if(y<=0) y=0
   if(y>=200) y=200
    return{
        x, y
    }
})
</script>
<template>
  <div class="goods-image">
    <!-- 大盒子 -->
    <div class="large" v-show="!isOutside" :style="[{backgroundImage:`url(${images[current]})`,backgroundPosition:`${-position.x*2}px ${-position.y*2}px`}]" ></div>
    <!-- 中型图片 放大镜与dom元素绑定-->
    <div class="middle" ref="target" >
      <img
        :src="images[current]"
        alt=""
      />
      <!-- 遮罩层 -->
      <div class="layer" v-show="!isOutside" :style="{left:`${position.x}px`,top:`${position.y}px`}"></div>
    </div>
    <ul class="small">
      <li v-for="(item,index) in images" :key="index" :class="{active:index===current}" @mouseenter="current=index">
        <img
          :src="item"
          alt=""
        />
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
 .large {
   position: absolute;
   top: 0;
   left: 412px;
   width: 400px;
   height: 400px;
   box-shadow: 0 0 10px rgba(0,0,0,0.1);
   background-repeat: no-repeat;
   background-size: 800px 800px;
   background-color: #f8f8f8;
 }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
   cursor: move;
   .layer {
     width: 200px;
     height: 200px;
     background: rgba(0,0,0,.2);
     left: 0;
     top: 0;
     position: absolute;
   }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
